When an FBI evidence locker is robbed, leaving behind a dead ERT agent, the team discovers a vigilante duo looking to take down a high-scale pedophile ring. Meanwhile, Isobel meets the new Assistant Director in Charge.

Following the assassination of a major corporate executive, the team races to find leaders of a dormant terrorist organization that has reemerged. Meanwhile, OA is temporarily reassigned after refusing to follow orders but is paired up with a familiar face.